Work vehicle with a bracket supporting post-treatment apparatuses

ABSTRACT

A work vehicle includes a vehicle frame, a radiator, an engine, a first post-treatment apparatus, a second post-treatment apparatus, and a bracket. The engine is provided in front of the radiator. The first post-treatment apparatus and the second post-treatment apparatus are positioned in front of the radiator and treat exhaust from the engine. The bracket is positioned in front of the radiator and is elastically supported by the vehicle frame. The bracket supports the engine, the first post-treatment apparatus, and the second post-treatment apparatus. Both the highest position of the first post-treatment apparatus and the highest position of the second post-treatment apparatus are no higher than the highest position of the radiator.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National stage application of InternationalApplication No. PCT/JP2012/083765, filed on Dec. 27, 2012. This U.S.National stage application claims priority under 35 U.S.C. §119(a) toJapanese Patent Application No. 2012-278010, filed in Japan on Dec. 20,2012, the entire contents of which are hereby incorporated herein byreference.

BACKGROUND

1. Filed of the Invention

The present invention relates to a work vehicle which is provided with aworking implement.

2. Background Information

A post-treatment apparatus which treats exhaust from an engine ismounted in the work vehicle (refer to Japanese Laid-Open PatentApplication Publication No. 2011-529538). The post-treatment apparatusis connected to the engine by a connecting pipe. It is preferable thatthe post-treatment apparatus include a diesel particulate filter (DPF)apparatus and a selective catalytic reduction (SCR) apparatus (refer toJapanese Laid-Open Patent Application Publication No. 2012-097413). TheDPF apparatus reduces particulate matter in the exhaust. The SCRapparatus reduces nitrogen oxide (NOx) in the exhaust.

In Japanese Laid-Open Patent Application Publication No. 2011-529538,the post-treatment apparatus is arranged above the engine or a hydraulicpump. In Japanese Laid-Open Patent Application Publication No.2012-097413, the post-treatment apparatus is arranged above thehydraulic pump. The post-treatment apparatus is supported on a tablewhich is connected to a vehicle frame.

The work vehicle may perform excavation work using a ripper (refer to aripper 51 in FIG. 1 and FIG. 2) which is provided in a rear section ofthe vehicle. At that time, the vehicle frame may be twisted.Accordingly, as in Japanese Laid-Open Patent Application Publication No.2012-097413, in a case where the post-treatment apparatus is supportedby a component connected to the vehicle frame, an excessive load isapplied to the connecting pipe which links the post-treatment apparatusand the engine.

On the other hand, a method of mounting the post-treatment apparatus ontop of the engine as in Japanese Laid-Open Patent ApplicationPublication No. 2011-529538 may be effective in avoiding the aboveproblem. With this method, the position of the post-treatment apparatusis installed at a higher position and an upper surface of an outer coverwhich covers the engine and the post-treatment apparatus is heightened.As a result, rear visibility becomes poor.

A work vehicle according to an aspect of the present invention comprisesa vehicle frame, a radiator, an engine, a first post-treatmentapparatus, a second post-treatment apparatus, and a bracket. The engineis provided in front of the radiator. The first post-treatment apparatusand the second post-treatment apparatus are positioned in front of theradiator and treat exhaust from the engine. The bracket is positioned infront of the radiator and is elastically supported by the vehicle frame.The bracket supports all of the engine, the first post-treatmentapparatus, and the second post-treatment apparatus. Both the highestposition of the first post-treatment apparatus and the highest positionof the second post-treatment apparatus are as high as or lower than thehighest position of the radiator.

At least one of the first post-treatment apparatus and the secondpost-treatment apparatus may be arranged in a position which does notoverlap with the engine in top view.

The bracket may include a mounting bracket and a post-treatmentapparatus support bracket. The mounting bracket supports the engine andmay be elastically supported by the vehicle frame. The post-treatmentapparatus support bracket supports the first post-treatment apparatusand the second post-treatment apparatus. The post-treatment apparatussupport bracket may be supported by the mounting bracket at one edge ofthe mounting bracket. The mounting bracket may include a damper mountingsection between the one edge which supports the post-treatment apparatussupport bracket and the other edge.

The post-treatment apparatus support bracket may include an uppersupport section and a lower support section with different heights froma connecting position with the mounting bracket. The firstpost-treatment apparatus may be supported by the lower support section.The second post-treatment apparatus may be supported by the uppersupport section.

The second post-treatment apparatus may be arranged so as to overlapwith a portion of the first post-treatment apparatus in top view.

The work vehicle may further comprise a connecting pipe. The connectingpipe is arranged above the first post-treatment apparatus and connectsthe first post-treatment apparatus and the second post-treatmentapparatus. The second post-treatment apparatus may be arranged to beadjacent to the side of the connecting pipe.

The upper support section may be positioned at a closer position to theengine than the lower support section in top view. The firstpost-treatment apparatus may be a diesel particulate filter apparatus.The second post-treatment apparatus may be a selective catalyticreduction apparatus. Then, the first post-treatment apparatus may bearranged at a position which does not overlap with the engine in topview.

The work vehicle may further comprise an outer cover. The outer cover isarranged above the engine, the first post-treatment apparatus, thesecond post-treatment apparatus, and the radiator and is attached to thevehicle frame. The upper surface of the outer cover is set horizontally.

The vehicle frame may include a first support section which supports thebracket and a second support section which supports the radiator. Thesecond support section may be lower than the first support section.

The post-treatment apparatus support bracket may further include ananti-sway component. The anti-sway component is connected to the engineand reduces vibration of the post-treatment apparatus support bracket inthe vehicle front and back direction.

In the work vehicle according to an aspect of the present invention, thebracket supports both of the engine and the post-treatment apparatussupport bracket. Then, the bracket is elastically supported by thevehicle frame. Accordingly, the engine, the first post-treatmentapparatus, and the second post-treatment apparatus all vibrate withregard to the twist of the vehicle frame. As a result, a large load isnot applied to the connecting pipe which links the post-treatmentapparatus and the engine.

In addition, both the highest position of the first post-treatmentapparatus and the highest position of the second post-treatmentapparatus are as high as or lower than the highest position of theradiator. Accordingly, the upper surface of the outer cover is notheightened due to the post-treatment apparatuses. As a result, the rearvisibility is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a perspective view of an external appearance of awork vehicle.

FIG. 2 illustrates a side view of a work vehicle.

FIG. 3 illustrates a right side view of an internal configuration of anengine compartment.

FIG. 4 illustrates an enlarged view of the vicinity of a post-treatmentunit of FIG. 3.

FIG. 5 illustrates a top view of an internal configuration of an enginecompartment.

FIG. 6 illustrates a perspective view of the post-treatment unit whichis seen from the A direction of FIG. 3 and FIG. 5.

FIG. 7 illustrates a perspective view of the post-treatment unit whichis seen from the B direction of FIG. 3 and FIG. 5.

FIG. 8 illustrates a perspective view of a post-treatment apparatussupport bracket.

FIG. 9 illustrates a modified example of an embodiment of the presentinvention.

DESCRIPTION OF THE EMBODIMENTS

Overall Configuration

FIG. 1 and FIG. 2 illustrate a perspective view and a side view of anexternal appearance of a work vehicle 1 according to an embodiment ofthe present invention. The work vehicle 1 is, for example, a motorgrader. The work vehicle 1 is provided with driving wheels which includefront wheels 11 and rear wheels 12. In FIG. 1 and FIG. 2, a case isillustrated where the work vehicle 1 is provided with a pair of twofront wheels 11 to the left and right and four rear wheels 12 with twoon each side, but the number and arrangement of the driving wheels isnot limited to those in the above description. The work vehicle 1 canperform ground leveling work, snow removal work, light cutting, materialmixing, and the like using a blade 42 provided between the front wheels11 and the rear wheels 12. Here, in FIG. 1 and FIG. 2, out of the rearwheels 12, only the rear wheels positioned at the right side areillustrated. Here, in the following description, the front and backdirection has the meaning of the front and back direction of the workvehicle 1. In other words, the front and back direction has the meaningof the front and back direction as seen by an operator who is seated ina cab 3. In addition, the left and right direction or the lateraldirection has the meaning of the vehicle width direction of the workvehicle 1. In other words, the left and right direction, the vehiclewidth direction, or the lateral direction are the direction to the leftand right as seen by the operator described above. In addition, in thediagrams, the front and back direction is shown as the X axis, the leftand right direction is shown as the Y axis, and the vertical directionis shown as the Z axis.

As shown in FIGS. 1 and 2, the work vehicle 1 is provided with a vehicleframe 2, the cab 3, a working implement 4, and a rear working implement5. In addition, the work vehicle 1 is also provided with components(refer to FIG. 3 and FIG. 5) arranged in an engine compartment 6.

Vehicle Frame 2 and Cab 3

The vehicle frame 2 comprises a rear section frame 21, a front sectionframe 22, and an outer cover 25 as shown in FIG. 1 and FIG. 2.

The rear section frame 21 supports the outer cover 25, the componentsarranged in the engine compartment 6 which will be described later, andthe like. The outer cover 25 covers the engine compartment 6. Inaddition, the rear wheels 12 which will be described later are providedin the rear section frame 21. The vehicle moves due to the rotationaldrive of the rear wheels 12 caused by the driving force from an engine61 (refer to FIG. 3 and FIG. 5).

The front section frame 22 is attached to the front of the rear sectionframe 21. The front wheels 11 are attached to the front end section ofthe front section frame 22.

The cab 3 is located on the rear section frame 21. A handle, a shiftlever, an operating lever for the working implement 4, a brake, anaccelerator pedal, an inching pedal, and the like (which are not shownin the diagram) are provided in an inner section of the cab 3. Here, thecab 3 may be located on the front section frame 22.

Working Implement 4

The working implement 4 includes a drawbar 40, a circle 41, the blade42, a hydraulic motor 49, various types of hydraulic cylinders 44 to 48,and the like.

The front end section of the drawbar 40 is attached to the front endsection of the front section frame 22 so as to be able to pivot. Due tothe synchronized expansion and contraction of a pair of lift cylinders44 and 45, the rear end section of the drawbar 40 is raised and lowered.In addition, the drawbar 40 swings up and down centering on an axisalong the traveling direction of the vehicle due to the lift cylinders44 and 45 expanding and contracting differently. Furthermore, thedrawbar 40 moves to the left and right due to the expansion andcontraction of a drawbar shift cylinder 46.

The circle 41 is attached to the rear end section of the drawbar 40 soas to be able to rotate. The circle 41 is driven by the hydraulic motor49 (refer to FIG. 1). The circle 41 rotates in the clockwise orcounterclockwise direction with regard to the drawbar 40 as seen fromabove the vehicle.

The blade 42 is supported so as to be able to slide in the left andright direction with regard to the circle 41 and to be able to swing upand down centering on a shaft parallel to the left and right direction.The blade 42 can move in the left and right direction with regard to thecircle 41 using a blade shift cylinder 47. In addition, the blade 42 canchange orientation in the up and down direction by swinging centering ona shaft parallel to the left and right direction with regard to thecircle 41 using a tilt cylinder 48 (refer to FIG. 2) supported by thecircle 41. The blade shift cylinder 47 and the tilt cylinder 48 aresupported by the circle 41. As described above, the blade 42 can performraising and lowering with regard to the vehicle, changing theinclination with regard to the traveling direction, changing theinclination with regard to the horizontal direction, rotating, andshifting in the left and right direction via the drawbar 40 and thecircle 41.

The hydraulic motor 49 is driven to be able to rotate the circle 41 byhydraulic pressure supplied from a hydraulic pump (which is not shown inthe diagram) which will be described later.

The hydraulic cylinders 44 to 48 are cylinders which are driven byhydraulic pressure supplied from the hydraulic pump. A pair of liftcylinders 44 and 45 is provided spaced apart to the left and right tointerpose the front section frame 22. The lift cylinders 44 and 45 aresubstantially arranged along the vertical direction. The lift cylinders44 and 45 are attached to the front section frame 22 and the drawbar 40.The lift cylinders 44 and 45 expand and contract to move the rear endsection of the drawbar 40 up and down. In this way, the lift cylinders44 and 45 can move the blade 42 in the up and down direction.

The drawbar shift cylinder 46 is arranged to be inclined with regard tothe up and down direction. The drawbar shift cylinder 46 is attached tothe side end section of the front section frame 22 and the drawbar 40.The drawbar shift cylinder 46 can expand and contract to change theposition of the drawbar 40 with regard to the horizontal direction. Inthis way, the drawbar shift cylinder 46 can change the position of theblade 42.

The blade shift cylinder 47 is arranged along the longitudinal directionof the blade 42. The blade shift cylinder 47 is attached to the circle41 and the blade 42. The blade shift cylinder 47 can expand and contractto change the position of the blade 42 in the longitudinal direction.

The tilt cylinder 48 is attached to the circle 41 and the blade 42. Thetilt cylinder 48 can expand and contract to swing the blade 42 up anddown centering on a shaft along the horizontal direction. In this way,the tilt cylinder 48 can change the angle of inclination of the blade 42with regard to the traveling direction.

Rear Section Work Machine 5

The rear working implement 5 can be attached to or detached from thework vehicle 1. Accordingly, the work vehicle 1 need not include therear working implement 5. The rear working implement 5 has the ripper51, a lifting cylinder 52, and the like. The ripper 51 is used inexcavation work. The ripper 51 is attached to the rear section frame 21so as to be able to be lifted and lowered. The lifting cylinder 52 is acylinder which is driven by hydraulic pressure supplied from thehydraulic pump. The lifting cylinder 52 can expand and contract to movethe rear end section of the ripper 51 up and down. In this way, thelifting cylinder 52 can move the ripper 51 in the vertical direction.

Internal Configuration of Engine Compartment 6

FIG. 3 illustrates a right side view of the internal configuration of anengine compartment. FIG. 4 illustrates an enlarged view of the vicinityof a post-treatment unit 8 (which will be described in detail later) ofFIG. 3. FIG. 5 illustrates a top view of the internal configuration ofthe engine compartment. In FIG. 3, for convenience of description, theoutlines of the rear section frame 21 and the outer cover 25 on theright side of the vehicle are shown by a two-dot chain line. In FIG. 5,the outlines of the outer cover 25 and a hydraulic oil tank 101 whichwill be described later are shown by a two-dot chain line and theoutline of a reducing agent tank 67 which will be described later isshown by a dotted line. Here, in FIG. 3 to FIG. 5, covers 100 a to 100 c(refer to FIG. 6 and FIG. 7, described in detail later) are not shownfor convenience of description.

As shown in FIG. 3 and FIG. 5, the engine 61, a power transmissionapparatus 7, a radiator 65, the post-treatment unit 8, the hydraulic oiltank 101, and the like are arranged in the engine compartment 6. A fueltank 66 and the reducing agent tank 67 are arranged below the enginecompartment 6. In other words, the fuel tank 66 and the reducing agenttank 67 are arranged so as to protrude below the vehicle frame. Theengine compartment 6 is covered by the outer cover 25.

As shown in FIG. 3, the rear section frame 21 includes a first supportsection 21 a and a second support section 21 b with different heights inthe vertical direction, and a tapered section 21 c. The first supportsection 21 a is higher than the second support section 21 b in thevertical direction. The tapered section 21 c is positioned between thefirst support section 21 a and the second support section 21 b. Here,the first support section 21 a, the second support section 21 b, and thetapered section 21 c are arranged to be substantially left and rightsymmetrical at both the left and right sides of the rear section frame21.

The outer cover 25 is attached to the rear section frame 21. The outercover 25 covers the engine compartment. That is, the outer cover 25 isarranged above the engine 61, a first post-treatment apparatus 91, asecond post-treatment apparatus 92, and the radiator 65.

Fuel retained in the fuel tank 66 is supplied to the engine 61. Theengine 61 generates driving force by burning the fuel and transmits thedriving force to the torque converter 62 and the hydraulic pump. Abracket 9 is attached to the engine 61. In more detail, a mountingbracket 70 is attached to the engine 61. The mounting bracket 70 isattached to the rear section frame 21 through dampers 73 and 74 (referto FIG. 5). In more detail, the mounting bracket 70 is attached to thefirst support section 21 a through the dampers 73 and 74. Accordingly,the mounting bracket 70 supports the engine 61. That is, the bracket 9supports the engine 61. In other words, the mounting bracket 70 (thebracket 9) and the engine 61 are elastically supported by the firstsupport section 21 a. That is, the mounting bracket 70 (the bracket 9)and the engine 61 are elastically supported by the rear section frame21. The details of the bracket 9 and the mounting bracket 70 will bedescribed later.

The power transmission apparatus 7 includes the torque converter 62 anda transmission 63. The torque converter 62 and the transmission 63 arearranged below the hydraulic oil tank 101. Flanges 63 a and 63 b (referto FIG. 5) are attached to the transmission 63. The flange 63 a isattached to the rear section frame 21 through dampers 79 a and 79 b. Theflange 63 b is attached to the rear section frame 21 through dampers 79c and 79 d (refer to FIG. 5). In more detail, the flanges 63 a and 63 bare attached to the first support section 21 a through the dampers 79 ato 79 d. In other words, the torque converter 62 and the transmission 63are elastically supported by the first support section 21 a. That is,the torque converter 62 and the transmission 63 are elasticallysupported by the rear section frame 21.

The torque converter 62 is connected to the output side of the engine61. The transmission 63 is connected to the output side of the torqueconverter 62. The transmission 63 includes a hydraulic-type clutch,transmission gears, and the like (which are not shown in the diagram)inside the transmission 63. The transmission 63 converts the rotationalspeed and torque of its input shaft which is connected to the outputside of the torque converter 62. The converted rotational speed andtorque are eventually transmitted from an output shaft of thetransmission 63 to the rear wheels 12 via a final reduction gear andtandem apparatus (which are not shown in the diagram). The vehicle movesdue to the rotational driving of the rear wheels 12.

A hydraulic pump (which is not shown in the diagram) is provided toaccompany the transmission 63. The hydraulic pump drives each type ofclutch of the transmission 63, the hydraulic motor 49, and each type ofcylinder 44 to 48 using the hydraulic pressure of hydraulic oil retainedin the hydraulic oil tank 101.

The radiator 65 cools cooling water in the engine 61. Here, the radiator65 is provided behind the engine 61 and the post-treatment unit 8 in thevehicle. In other words, the engine 61 and the post-treatment unit 8 areprovided in front of the radiator 65 in the vehicle. The radiator 65 issupported by the second support section 21 b. That is, the radiator 65is supported by the rear section frame 21 at a position which is lowerthan a position which is supported by the mounting bracket 70. That is,the radiator 65 is supported by the rear section frame 21 at a positionwhich is lower than the position where the bracket 9 is supported by therear section frame 70.

Internal Configuration of Post-Processing Unit 8

Next, the details of the post-treatment unit 8 will be described. FIG. 6illustrates a perspective view of the post-treatment unit 8 which isseen from the A direction of FIG. 3 and FIG. 5. FIG. 7 illustrates aperspective view of the post-treatment unit 8 which is seen from the Bdirection of FIG. 3 and FIG. 5. In FIG. 6 and FIG. 7, for convenience ofdescription, the illustration of the shape of a portion of the engine61, a partition wall 68, a protective cover 99 of a supply pipe 98 ofthe reducing agent, and a portion of the pipe is omitted.

As shown in FIG. 4, FIG. 6, and FIG. 7, the post-treatment unit 8includes a post-treatment apparatus support bracket 80, the firstpost-treatment apparatus 91, the second post-treatment apparatus 92, anda second connecting pipe 93. In addition, the work vehicle 1 is furtherprovided with a first connecting pipe 69, and an exhaust pipe 26. Thefirst connecting pipe 69 is a pipe for feeding exhaust of the engine 61to the post-treatment unit 8. The first connecting pipe 69 connects theengine 61 and the first post-treatment apparatus 91. The exhaust pipe 26is a pipe for discharging exhaust, which is processed in thepost-treatment unit 8, from the engine 61.

In the present embodiment, the first post-treatment apparatus 91 is, forexample, a diesel particulate filter apparatus and treats the exhaustfrom the engine 61 which is fed via the first connecting pipe 69. Thefirst post-treatment apparatus 91 captures particulate matter includedin the exhaust using a filter. The first post-treatment apparatus 91incinerates the captured particulate matter using a heater installed inthe filter.

As shown in FIG. 5, the first post-treatment apparatus 91 is positionedin front of the radiator 65. As shown in FIG. 3 to FIG. 7, the firstpost-treatment apparatus 91 has a substantially cylindrical outline. Asshown in FIG. 5, the first post-treatment apparatus 91 is arranged suchthat a center axis line Ay1 thereof is along the vehicle widthdirection.

As shown in FIG. 4 and FIG. 6, the first post-treatment apparatus 91includes a first connection port 91 a and a second connection port 91 b.The first connecting pipe 69 is connected to the first connection port91 a. The second connecting pipe 93 is connected to the secondconnection port 91 b.

The first connection port 91 a protrudes obliquely upward. Specifically,the first connection port 91 a protrudes obliquely upward and toward theengine 61 side. In contrast to this, the first connecting pipe 69extends obliquely downward toward the first post-treatment apparatus 91from a connecting position with the engine 61. As a result, the highestposition of the first post-treatment apparatus 91 is lower than thehighest position of the engine 61. In addition, the first post-treatmentapparatus 91 is arranged at a position which does not overlap with theengine 61 in top view. That is, at least one of the first post-treatmentapparatus 91 and the second post-treatment apparatus 92 is arranged at aposition which does not overlap with the engine 61 in top view.

The second connection port 91 b inclines slightly toward the rear fromthe vertical direction. As a result, as shown in FIG. 5, a center axisline Ay3 of a linear section 93 b (which is described in detail later)of the second connecting pipe 93 is positioned slightly behind thecenter axis line Ay1 in top view.

The second connecting pipe 93 is a relay connecting pipe which connectsthe first post-treatment apparatus 91 and the second post-treatmentapparatus 92. As shown in FIG. 4, the outer diameter of the secondconnecting pipe 93 is smaller than the outer diameter of the firstpost-treatment apparatus 91. One end of the second connecting pipe 93 isconnected to the second connection port 91 b of the first post-treatmentapparatus 91. The other end of the second connecting pipe 93 isconnected to a third connection port 92 a of the second post-treatmentapparatus 92. The second connecting pipe 93 is arranged in the vicinityof the first post-treatment apparatus 91 above the first post-treatmentapparatus 91.

As shown in FIGS. 5 to 7, the second connecting pipe 93 includes a firstcurved portion 93 a, the linear section 93 b, and a second curvedportion 93 c. The linear section 93 b is positioned above the firstpost-treatment apparatus 91. As shown in FIG. 5, the linear section 93 bis arranged such that the center axis line Ay3 is along the vehiclewidth direction. That is, the linear section 93 b is arranged such thatthe center axis line Ay3 is parallel to the center axis line Ay1 of thefirst post-treatment apparatus 91. The first curved portion 93 a linksthe linear section 93 b and the second connection port 91 b. The secondcurved portion 93 c links the linear section 93 b and the thirdconnection port 92 a of the second post-treatment apparatus 92. Areducing agent ejection apparatus 94 is attached to the first curvedportion 93 a. The reducing agent ejection apparatus 94 ejects thereducing agent inside the second connecting pipe 93. The reducing agentis, for example, aqueous urea.

In the present embodiment, the second post-treatment apparatus 92 is,for example, a selective catalytic reduction apparatus. The secondpost-treatment apparatus 92 treats the exhaust, which is treated by thefirst post-treatment apparatus 91, from the engine 61. The secondpost-treatment apparatus 92 selectively reduces nitrogen oxide NOx.

The second post-treatment apparatus 92 has a substantially cylindricaloutline. As shown in FIG. 5, the second post-treatment apparatus 92 isarranged such that a center axis line Ay2 thereof is along the vehiclewidth direction. In addition, the second post-treatment apparatus 92 isarranged such that the center axis line Ay2 is parallel to the centeraxis line Ay1 of the first post-treatment apparatus 91.

As shown in FIG. 5, the second post-treatment apparatus 92 is positionedin front of the radiator 65. In more detail, the second post-treatmentapparatus 92 is arranged to be laterally adjacent to the secondconnecting pipe 93. In addition, as described above, the diameter of thesecond connecting pipe 93 is smaller than the diameter of the firstpost-treatment apparatus 91, and the center axis line Ay3 of the linearsection 93 b of the second connecting pipe 93 is positioned slightlybehind the center axis line Ay1 in top view. As a result, the secondpost-treatment apparatus 92 is arranged to overlap with a portion of thefirst post-treatment apparatus 91 in top view. In addition, the secondpost-treatment apparatus 92 is arranged so as to overlap with a portionof the engine 61 in top view.

The second post-treatment apparatus 92 is arranged such that the highestposition thereof is as high as or lower than the highest position of theradiator 65. FIG. 3 illustrates an example where the highest position ofthe second post-treatment apparatus 92 is as high as the highestposition of the radiator 65. However, the highest position of the secondpost-treatment apparatus 92 may be lower than the highest position ofthe radiator 65. In addition, the highest position of the firstpost-treatment apparatus 91 is lower than the highest position of thesecond post-treatment apparatus 92. Accordingly, both the highestposition of the first post-treatment apparatus 91 and the highestposition of the second post-treatment apparatus 92 are as high as orlower than the highest position of the radiator 65. Accordingly, asshown in FIG. 3, an upper surface 25 a of the outer cover 25 can be sethorizontally. Therefore, it is possible to realize excellent rearvisibility.

As shown in FIG. 3 to FIG. 7, the second post-treatment apparatus 92includes the third connection port 92 a and a fourth connection port 92b. The second connecting pipe 93 is connected to the third connectionport 92 a. The exhaust pipe 26 is connected to the fourth connectionport 92 b. That is, the exhaust pipe 26 is connected to the secondpost-treatment apparatus 92.

The third connection port 92 a is inclined slightly downward from thehorizontal direction toward the rear. Accordingly, as shown in FIG. 3,the center axis line Ay3 of the linear section 93 b of the secondconnecting pipe 93 is positioned slightly below the center axis line Ay2in the vertical direction.

The fourth connection port 92 b protrudes obliquely upward.Specifically, the fourth connection port 92 b protrudes upward andobliquely toward the engine 61 side. Due to this, the exhaust pipe 26protrudes obliquely upward above the engine 61. As a result, the outercover 25 can be lowered, as compared to a case in which the fourthconnection port 92 b protrudes exactly upward. Furthermore, it ispossible to arrange an air cleaner which is not shown in the diagrambetween the exhaust pipe 26 and the engine 61. The upper section of theexhaust pipe 26 protrudes upward from the outer cover 25.

The engine 61, the first connecting pipe 69, the first post-treatmentapparatus 91, the second connecting pipe 93, the second post-treatmentapparatus 92, and the exhaust pipe 26 are connected in series in thisorder. Accordingly, the exhaust from the engine 61 passes through thefirst connecting pipe 69 and is fed to the first post-treatmentapparatus 91. In the first post-treatment apparatus 91, the particulatematter is mostly reduced from the exhaust. Next, the exhaust passesthrough the second connecting pipe 93 and is fed to the secondpost-treatment apparatus 92. In the second post-treatment apparatus 92,the NOx is mostly reduced. Thereafter, the exhaust gas which has beencleaned passes through the exhaust pipe 26 and is discharged to theoutside.

Support Member of Post-Treatment Unit 8

Next, the manner in which each of the components of the post-treatmentunit 8 is supported will be described. Here, for convenience ofdescription, the mounting bracket 70 and the post-treatment apparatussupport bracket 80 are together referred to as the bracket 9.Accordingly, the bracket 9 includes the mounting bracket 70 and thepost-treatment apparatus support bracket 80. As shown in FIG. 6, themounting bracket 70 has a first mounting component 71 and a secondmounting component 72.

As shown in FIG. 7, the first mounting component 71 is attached to theright side surface of the engine 61 by a bolt or the like. The firstmounting component 71 includes a first damper mounting section 71 a anda first unit mounting section 71 b. The first unit mounting section 71 bis provided at one end (the rear end) of the first mounting component71. That is, the first unit mounting section 71 b is provided at one end(the rear end) of the mounting bracket 70. The post-treatment unit 8 isattached to the first unit mounting section 71 b. In more detail, thepost-treatment apparatus support bracket 80 is fixed to the first unitmounting section 71 b by a bolt or the like. The first damper mountingsection 71 a is provided between one end (the rear end) and the otherend (the front end) of the first mounting component 71 which is providedwith the first unit mounting section 71 b. That is, the first dampermounting section 71 a is provided between one end (the rear end) and theother end (the front end) of the mounting bracket 70 which is providedwith the first unit mounting section 71 b. The first support section 21a includes a first protruding section 21 e which protrudes inside thevehicle, and the first damper mounting section 71 a overlaps with thefirst protruding section 21 e. A damper 73 is attached to the firstdamper mounting section 71 a and the damper 73 is mounted on the firstprotruding section 21 e.

As shown in FIG. 6, the second mounting component 72 is attached to theleft side surface of the engine 61 by a bolt or the like. The secondmounting component 72 includes a second damper mounting section 72 a anda second unit mounting section 72 b. The second unit mounting section 72b is provided at one end (the rear end) of the second mounting component72. That is, the second unit mounting section 72 b is provided at oneend (the rear end) of the mounting bracket 70. The post-treatment unit 8is attached to the second unit mounting section 72 b. In more detail,the post-treatment apparatus support bracket 80 is fixed to the secondunit mounting section 72 b by a bolt or the like. The second dampermounting section 72 a is provided between one end (the rear end) and theother end (the front end) of the second mounting component 72 which isprovided with the second unit mounting section 72 b. That is, the seconddamper mounting section 72 a is provided between one end (the rear end)and the other end (the front end) of the mounting bracket 70 which isprovided with the second unit mounting section 72 b. The first supportsection 21 a includes a second protruding section 21 f which protrudesinside the vehicle, and the second damper mounting section 72 a overlapswith the second protruding section 21 f. The damper 74 is attached tothe second damper mounting section 72 a and the damper 74 is mounted onthe second protruding section 21 f.

Due to such a configuration, the post-treatment unit 8 can be attachedto and detached from the mounting bracket 70 in the first unit mountingsection 71 b and the second unit mounting section 72 b at one end (therear end) of the mounting bracket 70. In other words, the post-treatmentunit 8 is supported by the mounting bracket 70 at one end (the rear end)of the mounting bracket 70. In more detail, the post-treatment apparatussupport bracket 80 is supported by the mounting bracket 70 at one end(the rear end) of the mounting bracket 70. In addition, thepost-treatment unit 8 is elastically supported by the first supportsection 21 a. That is, the post-treatment unit 8 is elasticallysupported by the rear section frame 21. Accordingly, the post-treatmentunit 8 vibrates integrally with the engine 61.

In addition, as described above, the torque converter 62 and thetransmission 63, the torque converter 62 and the engine 61, the engine61 and the mounting bracket 70, the mounting bracket 70 and thepost-treatment unit 8 are connected to each other, and the components ofthem are all connected to the rear section frame 21 via the dampers 79 ato 79 d, 73, and 74. Accordingly, the torque converter 62, transmission63, the engine 61, and the post-treatment unit 8 vibrate integrally andare not easily affected by the vibration from the rear section frame 21.

FIG. 8 illustrates a perspective view of a post-treatment apparatussupport bracket 80. The post-treatment apparatus support bracket 80includes a lower member 81, an upper member 87, and an anti-swaycomponent 89 (refer to FIG. 7). FIG. 8 illustrates only the lower member81 and the upper member 87. The upper member 87 is detachably mounted onthe lower member 81. The lower member 81 includes a right leg section82, a left leg section 83, a lower step section 84, an upper stepsection 85, and lower support sections 86 a and 86 b. The upper member87 includes upper support sections 88 a and 88 b. As shown in FIG. 5,the post-treatment apparatus support bracket 80 is positioned in frontof the radiator 65.

The right leg section 82 includes first connecting sections 82 a, 82 b,and 82 c for fixing to the first unit mounting section 71 b. In the samemanner, the left leg section 83 includes second connecting sections 83a, 83 b, and 83 c for fixing to the second unit mounting section 72 b.

An opening section 81 a is formed between the right leg section 82 andthe left leg section 83 and below the lower step section 84. That is,the post-treatment apparatus support bracket 80 includes the openingsection 81 a. In the opening section 81 a, it is possible to provideanother power unit which is not shown in the diagram via a PTO (powertake off) pump (which is not shown in the diagram) which is connected toa connecting pipe 61 a (refer to FIG. 6) with the engine 61.

The upper step section 85 and the lower step section 84 have differentheights from a connecting position with the mounting bracket 70 (theposition of the first connecting sections 82 a to 82 c and the secondconnecting sections 83 a to 83 c). In more detail, the upper stepsection 85 is higher than the lower step section 84. The lower member 81has a stepped shape which includes the upper step section 85 and thelower step section 84. In addition, as shown in FIG. 4 and the like, thelower member 81 is arranged such that the upper step section 85 ispositioned at a closer position to the engine 61 than the lower stepsection 84 in top view.

Furthermore, the upper step section 85 includes a third connectingsection 85 a on the side surface of the engine 61 side. As shown in FIG.4 and FIG. 7, the anti-sway component 89 is attached to the thirdconnecting section 85 a. The anti-sway component 89 is connected to theengine 61 and links the upper portion of the engine 61 and the upperstep section 85. Since the post-treatment unit 8 has a heavy object atthe upper section thereof, the upper portion of the post-treatment unit8 can easily vibrate considerably, in particular in the front and backdirection, due to the vibration of the mounting bracket 70. Theanti-sway component 89 is fixed to the upper section of the engine 61,so that the anti-sway component 89 reduces vibration of the upperportion of the post-treatment unit 8 in the front and back direction.

Lower support sections 86 a and 86 b are provided over the lower stepsection 84. The lower support sections 86 a and 86 b support the firstpost-treatment apparatus 91. That is, the post-treatment apparatussupport bracket 80 supports the first post-treatment apparatus 91. Inother words, the bracket 9 supports the first post-treatment apparatus91. The first post-treatment apparatus 91 has a substantiallycylindrical outline, and the lower support section 86 a and 86 b havecontact surfaces which correspond to the peripheral surface of the firstpost-treatment apparatus 91. In more detail, the lower support sections86 a and 86 b have contact surfaces with a convex shape which expands ina downward direction.

The lower support sections 86 a and 86 b include fourth connectingsections 86 c, 86 d, 86 e, and 86 f. The fourth connecting sections 86 cto 86 f include holes which first fastening components 95 a and 95 b(refer to FIG. 6) which are fastened to the first post-treatmentapparatus 91 pass through. As shown in FIG. 4 and FIG. 6, in the fourthconnecting sections 86 c to 86 f, the first fastening components 95 aand 95 b are fastened with a nut to the back of the lower supportsections 86 a and 86 b which is opposite to the side where the firstpost-treatment apparatus 91 is supported. In this manner, the firstpost-treatment apparatus 91 is fastened onto the lower support sections86 a and 86 b by the first fastening components 95 a and 95 b.

When the upper member 87 is attached to the lower member 81, the uppersupport sections 88 a and 88 b are positioned over the upper stepsection 85. Accordingly, the upper support sections 88 a and 88 b andthe lower support sections 86 a and 86 b have different heights from theconnecting position with the mounting bracket 70 (the position of thefirst connecting sections 82 a to 82 c and the second connectingsections 83 a to 83 c). In more detail, the upper support sections 88 aand 88 b are higher than the lower support sections 86 a and 86 b.Furthermore, as shown in FIG. 4 and the like, the upper support sections88 a and 88 b are positioned at a closer position to the engine 61 thanthe lower support sections 86 a and 86 b in top view.

The upper support section 88 a and 88 b support the secondpost-treatment apparatus 92. That is, the post-treatment apparatussupport bracket 80 supports the second post-treatment apparatus 92. Inother words, the bracket 9 supports the second post-treatment apparatus92. The second post-treatment apparatus 92 has a substantiallycylindrical outline, and the upper support sections 88 a and 88 b havecontact surfaces which correspond to the peripheral surface of thesecond post-treatment apparatus 92. In more detail, the upper supportsections 88 a and 88 b have contact surfaces with a convex shape whichexpand in a downward direction.

The upper support sections 88 a and 88 b include fifth connectingsections 88 c, 88 d, 88 e, and 88 f. The fifth connecting sections 88 cto 88 f include holes which second fastening components 96 a and 96 b(refer to FIG. 6) which are fastened to the second post-treatmentapparatus 92 pass through. As shown in FIG. 4 or FIG. 6, in the fifthconnecting sections 88 c to 88 f, the second fastening components 96 aand 96 b are fastened with a nut to the back of the upper supportsections 88 a and 88 b which is opposite to the side where the secondpost-treatment apparatus 92 is supported. In this manner, the secondpost-treatment apparatus 92 is fastened onto the upper support sections88 a and 88 b by the second fastening components 96 a and 96 b.

Here, the lower step section 84 may further have first cover connectingsections 84 a and 84 b. A first cover 100 a (refer to FIG. 7) whichcovers the right side surface of the first post-treatment apparatus 91is attached to the first cover connecting sections 84 a and 84 b.

The lower support section 86 b may further have second cover connectingsections 86 g and 86 h. A second cover 100 b (refer to FIG. 6) whichcovers the left side surface of the first post-treatment apparatus 91 isattached to the second cover connecting sections 86 g and 86 h.

The upper step section 85 may further have third cover connectingsections 85 b and 85 c. A third cover 100 c (refer to FIG. 7) whichcovers the right side surface of the second post-treatment apparatus 92is attached to the third cover connecting sections 85 b and 85 c.

In addition, the upper step section 85 may further have a sixthconnecting section 85 d and a seventh connecting section 85 e. A thirdfastening component 97 (refer to FIG. 6) which is fastened to the secondconnecting pipe 93 is attached to the sixth connecting section 85 d. Afourth fastening component 27 (refer to FIG. 6 and FIG. 7) which isfastened to the exhaust pipe 26 is attached to the seventh connectingsection 85 e.

Pipe of Reducing Agent

The reducing agent which is ejected by the reducing agent ejectionapparatus 94 is retained in the reducing agent tank 67. As describedabove, the reducing agent is, for example, aqueous urea. As shown inFIG. 3 and FIG. 5, the reducing agent tank 67 is arranged behind theradiator 65, but it is not necessarily limited thereto. The reducingagent tank 67 may be arranged in any place which the heat from theengine 61 and the post-treatment apparatuses 91 and 92 is not easilytransmitted to. As shown in FIG. 5, a top plate 21 d is provided overthe reducing agent tank 67. Due to this, hot air from the radiator 65does not directly hit the reducing agent tank 67 to restrain thereducing agent from being heated.

As shown in FIG. 3 and FIG. 4, the reducing agent is fed from thereducing agent tank 67 to the reducing agent ejection apparatus 94through the supply pipe 98 and a drawing pump 98 a. In order to restrainthe heat from the engine 61 and the post-treatment apparatuses 91 and 92from being conducted to the supply pipe 98, the work vehicle 1 isprovided with the partition wall 68 in the engine compartment 6. Thepartition wall 68 is arranged between the supply pipe 98 and thepost-treatment unit 8. The partition wall 68 is supported by theradiator 65 via a support member which is not shown in the diagram.

In addition, the outer cover 25 includes an air inlet port 25 b (referto FIG. 1 and FIG. 3) for drawing in outside air between the radiator 65and the partition wall 68 in top view. The work vehicle 1 is providedwith the protective cover 99 which covers the supply pipe 98 and thedrawing pump 98 a in the engine compartment 6 in order that the supplypipe 98 is not greatly cooled by the outside air which is drawn in andthe cold air from the radiator 65.

Advantageous Effects

The work vehicle 1 according to the present embodiment is provided withthe following features.

In the work vehicle 1, the bracket 9 supports both of the engine 61 andthe post-treatment apparatus support bracket 80. Then, the bracket 9 iselastically supported by the rear section frame 21 (the vehicle frame2). Accordingly, the engine 61, the first post-treatment apparatus 91and the second post-treatment apparatus 92 all vibrate with regard tothe twist of the rear section frame 21 (the vehicle frame 2). As aresult, a large load is not applied to the first connecting pipe 69which links the first post-treatment apparatus 91 and the engine 61. Asa result, it is not necessary to provide the first connecting pipe 69with a member which absorbs vibration such as a bellows. Furthermore, itis possible to shorten the first connecting pipe 69.

In addition, both the highest position of the first post-treatmentapparatus 91 and the highest position of the second post-treatmentapparatus 92 are as high as or lower than the highest position of theradiator 65. Accordingly, the upper surface of the outer cover 25 is notheightened due to the post-treatment apparatuses 91 and 92. Morespecifically, it is possible to set the upper surface of the outer cover25 horizontal. As a result, the rear visibility is improved.

At least one of the first post-treatment apparatus 91 and the secondpost-treatment apparatus 92 is arranged at a position which does notoverlap with the engine 61 in top view. In more detail, the firstpost-treatment apparatus 91 is arranged at a position which does notoverlap with the engine 61 in top view. As a result, compared to a casewhere both of the first post-treatment apparatus 91 and the secondpost-treatment apparatus 92 are arranged above the engine 61, it ispossible to lower the highest position of the post-treatment apparatuses(the higher position among the highest position of the firstpost-treatment apparatus 91 and the highest position of the secondpost-treatment apparatus 92). Accordingly, it is possible to lower theupper surface of the outer cover 25. As a result, the rear visibility isfurther improved.

The mounting bracket 70 includes the damper mounting sections 71 a and72 a between the one end where the post-treatment apparatus supportbracket 80 is supported and the other end. Then, the dampers 73 and 74are attached between the mounting bracket 70 and the rear section frame21. As a result, the load of the post-treatment unit 8, which is a heavyobject, is distributed to the front and back centered on the dampers 73and 74. Furthermore, a large load is not applied to the first connectingpipe 69 which links the first post-treatment apparatus 91 and the engine61 even if a twist is generated in the rear section frame 21 due to theripper work or the like. As a result, it is not necessary to provide thefirst connecting pipe 69 with a member which absorbs vibration such as abellows. Furthermore, it is possible to shorten the first connectingpipe 69.

The post-treatment apparatus support bracket 80 has the upper supportsections 88 a and 88 b and the lower support sections 86 a and 86 bwhose heights are different from the connecting positions 82 a to 82 cand 83 a to 83 c to the mounting bracket 70. Then, the firstpost-treatment apparatus 91 is supported by the lower support sections86 a and 86 b and the second post-treatment apparatus 92 is supported bythe upper support sections 88 a and 88 b. Accordingly, since the firstpost-treatment apparatus 91 and the second post-treatment apparatus 92are arranged at different heights, it is possible to shorten the lengthof the post-treatment unit 8 in the front and back direction. As aresult, it is possible to shorten the length of the rear section frame21 (that is, the vehicle frame 2) in the front and back direction.Therefore, it is possible to suppress the enlargement of the workvehicle 1.

The second post-treatment apparatus 92 is arranged to overlap with aportion of the first post-treatment apparatus 91 in top view. Inaddition, the second post-treatment apparatus 92 is arranged to beadjacent to the side of the second connecting pipe 93. Accordingly, itis possible to shorten the length of the lower member 81 (that is, thepost-treatment apparatus support bracket 80) in the front and backdirection. That is, it is possible to further shorten the length of thepost-treatment unit 8 in the front and back direction. As a result, itis possible to further shorten the length of the rear section frame 21(that is, the vehicle frame 2) in the front and back direction.

The upper support sections 88 a and 88 b are positioned at closerpositions to the engine 61 than the lower support sections 86 a and 86 bin top view. Accordingly, it is possible to arrange the engine 61 belowthe upper support sections 88 a and 88 b to further shorten the lengthof the rear section frame 21 (that is, the vehicle frame 2) in the frontand back direction.

The exhaust pipe 26 protrudes obliquely upward above the engine 61. Dueto this, since it is possible to provide a space between the engine 61and the exhaust pipe 26, it is possible to arrange an air cleaner in thespace. In addition, it is possible to lower the outer cover 25 comparedto a case where the exhaust pipe 26 protrudes vertically upward.

The rear section frame 21 (that is, the vehicle frame 2) includes thefirst support section 21 a which supports the mounting bracket 70 andthe second support section 21 b which supports the radiator 65. Then,the second support section 21 b is lower than the first support section21 a. Since the second support section 21 b is lower than the firstsupport section 21 a, it is possible to lower the upper surface of theouter cover 25 even when the radiator 65, which is large with a highcooling capacity, is mounted in order to mount the post-treatment unit 8on the work vehicle 1. As a result, the rear visibility is furtherimproved.

The post-treatment apparatus support bracket 80 further includes theanti-sway component 89 which is connected to the engine 61. By theanti-sway component 89, the upper portion of the post-treatmentapparatus support bracket 80 is fixed to the engine 61. As such, thevibration of the post-treatment apparatus support bracket 80 in thefront and back direction of the vehicle is reduced.

The post-treatment apparatus support bracket 80 includes the openingsection 81 a. Accordingly, it is possible to provide another power unitvia the PTO (power take off) pump in the opening section 81 a.

MODIFIED EXAMPLES

Above, an embodiment of the present invention has been described but thepresent invention is not limited to the embodiments described above andvarious modifications are possible in a scope which does not depart fromthe gist of the invention.

In the embodiment described above, an example where the transmission 63,the torque converter 62, the engine 61, the post-treatment unit 8, theradiator 65, and the reducing agent tank 67 are arranged in the enginecompartment 6 from the front of the vehicle to the rear in order hasbeen described. However, this order is arbitrary except for thearrangement of the engine 61 and of the post-treatment unit 8 in frontof the radiator 65.

FIG. 9 is a diagram illustrating a modified example of the embodiment ofthe present invention. In the modified example, the reducing agent tank67, the post-treatment unit 8, the engine 61, the torque converter 62,and the transmission 63 are arranged from the front of the vehicle tothe rear in order. A work vehicle according to the modified examplecauses the same effects as in the embodiment of the present invention.

In addition, in the embodiment described above, the first post-treatmentapparatus 91 is described as a diesel particulate filter apparatus andthe second post-treatment apparatus 92 is described as a selectivecatalytic reduction apparatus. However, the first post-treatmentapparatus 91 may be a selective catalytic reduction apparatus and thesecond post-treatment apparatus 92 may be a diesel particulate filterapparatus. Here, in this case, since it is preferable that the exhaustfrom the engine be first fed to the diesel particulate filter apparatus,the order and orientation of the pipes which is connected to the firstpost-treatment apparatus 91 or the second post-treatment apparatus 92 isreversed.

The upper surface of the outer cover 25 need not be set horizontally.For example, in a case where the highest position of the secondpost-treatment apparatus 92 is lower than the highest position of theradiator 65, the portion above the radiator 65 in the upper surface ofthe outer cover 25 may be higher than the portion above the secondpost-treatment apparatus 92.

The second post-treatment apparatus 92 need not overlap with the engine61 in top view.

The first mounting component 71 and the second mounting component 72 maybe formed integrally rather than as separate parts. Similarly, the lowermember 81 and the upper member 87 may be formed integrally rather thanas separate parts. Furthermore, the mounting bracket 70 and thepost-treatment apparatus support bracket 80 may be formed integrally asthe bracket 9.

The number of the dampers 73, 74, and 79 a to 79 d is arbitrary.However, it is desirable that the same number of dampers be provided inthe left and right directions.

The post-treatment apparatus support bracket 80 need not include eitheror both of the upper step section 85 and the lower step section 84.However, in such a case, the post-treatment apparatus support bracket 80includes the lower support sections 86 a and 86 b and the upper supportsections 88 a and 88 b with different heights.

The number of the lower support sections 86 a and 86 b, the uppersupport sections 88 a and 88 b, the first fastening components 95 a and95 b, and the second fastening components 96 a and 96 b are not limitedto two each, and may be one or three or more.

The number and positions of the first connecting section to the seventhconnecting section may be appropriately changed. In addition, thepost-treatment apparatus support bracket 80 need not include some or allof the first connecting section to the seventh connecting section. Thework vehicle 1 need not have some or all of the first cover 100 a, thesecond cover 100 b, and the third cover 100 c.

The shapes of the first post-treatment apparatus 91 and the secondpost-treatment apparatus 92 are not limited to a cylindrical shape orthe like, and may be another shape such as an elliptical shape or arectangular shape.

The first post-treatment apparatus 91 and the second post-treatmentapparatus 92 may be arranged to be lined up in a different directionfrom the vehicle width direction. That is, the first post-treatmentapparatus 91 and the second post-treatment apparatus 92 may be arrangedto be lined up in the vehicle front and back direction.

INDUSTRIAL APPLICABILITY

According to the present invention, it is possible to provide a workvehicle which maintains excellent rear visibility with a function ofexhaust treatment.

The invention claimed is:
 1. A work vehicle comprising: a vehicle frame;a radiator; an engine provided in front of the radiator; a firstpost-treatment apparatus positioned in front of the radiator andconfigured to treat exhaust from the engine; a second post-treatmentapparatus positioned in front of the radiator and configured to treatexhaust from the engine; and a bracket positioned in front of theradiator, the bracket being elastically supported by the vehicle frame,and the bracket supporting the engine, the first post-treatmentapparatus, and the second post-treatment apparatus, the vehicle frameincluding a first support section supporting the bracket and a secondsupport section supporting the radiator, the second support sectionbeing lower than the first support section, and a highest position ofthe first post-treatment apparatus and a highest position of the secondpost-treatment apparatus being no higher than a highest position of theradiator.
 2. The work vehicle according to claim 1, wherein at least oneof the first post-treatment apparatus and the second post-treatmentapparatus is arranged in a position which does not overlap with theengine as seen in a top view thereof.
 3. The work vehicle according toclaim 1, wherein the bracket includes: a mounting bracket supporting theengine and being elastically supported by the vehicle frame; and apost-treatment apparatus support bracket supported by the mountingbracket at a first edge of the mounting bracket, and the post-treatmentapparatus support bracket supporting the first post-treatment apparatusand the second post-treatment apparatus, the mounting bracket includinga damper mounting section between the first edge and a second edge ofthe mounting bracket.
 4. The work vehicle according to claim 3, whereinthe post-treatment apparatus support bracket includes an upper supportsection and a lower support section, with the upper and lower supportsections having different heights as measured from a connecting positionto the mounting bracket, the first post-treatment apparatus is supportedby the lower support section, and the second post-treatment apparatus issupported by the upper support section.
 5. The work vehicle according toclaim 4, wherein the second post-treatment apparatus is arranged so asto overlap with a portion of the first post-treatment apparatus as seenin a top view thereof.
 6. The work vehicle according to claim 4, furthercomprising: a connecting pipe arranged above the first post-treatmentapparatus, the connecting pipe connecting the first post-treatmentapparatus and the second post-treatment apparatus, the secondpost-treatment apparatus being adjacent to a side of the connectingpipe.
 7. The work vehicle according to claim 4, wherein the uppersupport section is positioned at a position closer to the engine thanthe lower support section as seen in a top view thereof.
 8. The workvehicle according to claim 7, further comprising: an exhaust pipeconnected to the second post-treatment apparatus, the exhaust pipeprotruding obliquely upward above the engine.
 9. The work vehicleaccording to claim 2, wherein the first post-treatment apparatus is adiesel particulate filter apparatus, the second post-treatment apparatusis a selective catalytic reduction apparatus, and the firstpost-treatment apparatus is arranged at a position which does notoverlap with the engine as seen in the top view thereof.
 10. The workvehicle according to claim 1, further comprising: an outer coverattached to the vehicle frame, the outer cover being arranged above theengine, the first post-treatment apparatus, the second post-treatmentapparatus, and the radiator, the upper surface of the outer cover beingdisposed horizontally.
 11. The work vehicle according to claim 3,wherein the post-treatment apparatus support bracket further includes ananti-sway component connected to the engine, the anti-sway componentbeing configured to reduce vibration of the post-treatment apparatussupport bracket along a vehicle front and back direction.